Which projects have conventional cash flow streams? [ A, A and D, B and C, C ] Which projects will have multiple IRRs? [ A, A and D, B and C, C ]

Year Project A Project B Project C Project D 1 -10000 -10000 -10000 -10000 2 4000 4000 4000 0 4000 4000 -4000 4000 4000 4000 4000 4000 4000 4000 4000 4000 4000 - 15000 - 15000 4000 OWN